DearProf.Wong,
IamdeeplysorrytoinformyouthatIdidnotcompletethetaskyoudesignatedlastweek,duetoasuddenillnessfallinguponmethesedays.Forthelastweek,Ihavebeeninahospitalwithacontinuousfever,whichpreventedmefromanyactivity.
Tomakeupmyfault,couldyoupleaseextendmydeadlinetonextFriday?Ifso,IpromiseIwillfinishthetaskandsendmyreporttoyouviaemail.
Idoapologizeagainforanyinconvenienceitmightbringtoyou,andhopeyoucouldacceptmyapology.
Sincerelyyours,
LiMing